用表达式算数据比较快，如何在datacols.add里面使用datadiff？我下面的代码报错：
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提示
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无法设置列"OR3D2complete"的表达式，原因:The expression contains undefined function call DateDiff().
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OK
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错误代码：
cmd.Con Name = "vis。。。。er"
cmd.CommandText = "。。。。Is not null"
dt = cmd.ExecuteReader()
dt.DataCols.Add("order2OR3D",Gettype(Integer),"DateDiff(d,[PO_receiveDate],[OR3D_start])")
dt.DataCols.Add("OR3D2complete",Gettype(Integer),"DateDiff(d,OR3D_start,OR3D_confirm)")
dt.DataCols.Add("or3d2oc",Gettype(Integer),"DateDiff(d,OR3D_confirm,OCstart)")
dt.DataCols.Add("oc2material",Gettype(Integer),"DateDiff(d,OCstart,iif(Material_available_date>Outlet_arrival,Outlet_arrival,Material_available_date))")
[此贴子已经被作者于2018/8/21 9:20:29编辑过]
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Post By：2018/8/21 9:18:00 [只看该作者]
